Improvement in machines for slotting and cutting metal



'hinted r Shura @sind @ibitzar SALMON W. PUTNAM, JR., 0F FITGHBURG,MASSACHUSETTS.

Letters Patent'No. 112,737, dated March 14, i871.

'-IMPROVEMENTN MAQHINES FOR SLOTTING ND CUTTING. METAL.

The Schedule referred to in these Lettersl Patent and making part of thesame.

specification, is a description of my invention sufiicient to enablethose skilled in the art to practice it,

My invention relates to one of the details of construction ororganization of machines for working metal, beingl particularlyapplicable to slotting-machinos.

In all such machines as heretofore made the cutting-point pr edge of thetool and the face cut by the tool in its descent or forward movementhave remained in the same plane during the rise or retreat of the tool,and the back-drag of the tool-edge against the metal sometimes breaksthe edge of the tool, always tends to dull such edge, sometimes mars thework, and always causes friction ofthe tool against the work.

The object of my invention is to so organize the mechanism as to avoidthe contact of the work and tool in the ascent or-retreat of the tool;and

The invention consists in a metal-working machine, having, incombination, a.wo1'ksupporting table; mechanism to impartfeed-movemeutsto said table; a reciprocating cutter; and mechanism to impart to thework-supporting table slight reciprocal movements, to remove the workaway from the outter after every forward thrust thereof, and before itchine as will.l enablethe improvement to beclearlyv understood.

C shows, in plan, (enlarged,) the mechanism with which the invention isimmediately connected.l

a denotes the upright frame ofthe machine, and

b, the sole .or bed. v

c is the tool-stock or ram, sliding vertically in guideways d, andhaving its reciprocating vertical movements imparted in the usualmanner.

e is the work-supporting table, to which transverse feed-movement,longitudinal feed-movement, or rotative feed-movement may be imparted inthe usual manner, and according to the character' of the work to beeffected. v

Through the bed f runsl the feed-screw g, by which forward or backwardmovement is imparted to the longitudinal slide h., upon which rests andslides the transverse slide t', that supports the work-plate or table e,the -slide h having a' nut-threaded projection, in which the feed-screwplays.

At the front end of the feed-screw g is a ratchetwheel, k, fast on theshaft, and with the teeth of this ratchet engages a reversible pawl, l,which may be set tov drive the wheel in either directiomor may be so setthat it will not engage. with the wheel.

This. pawl is jointed -to a pawl-arm, fm, which Ais jointed .to thelower end `of a rocker-arm, mxed on the outer 'end of a rocker-shaft, o.

At the opposite end of this shaft is a bevel-wheel, p, worked by asegment-gear, g, which is connected, by a link, fr, 4with arocker-lever, s,'on arocker-shaft, t, carrying an arm, from whichprojects a pin that enters the cam-groove of a cam-cylinder, rLL,-on"t'he driving-shaft o. y

Opposite toV the rocker-arm u -is another arm, 1v, connected, by a link,x, to an arm, y, projecting from the end of a screw-threaded sleeve, j.

'The feed-screw g runs through this sleeve, (which is nutthreaded,) andthe sleeve-screw works throngh a nut-thread in the bed j, the inner endworking against a collar, y2, fast on the feed-screw,while its outerend'works against a collar or clamp, z.

After the forward or'feed-movement ofthe cutting-tool takes place, andjust before the rise or retreat of the tool, the action of the cam drawsback the link x and turns the sleeve j, moving it out- Y ward, the.sleeve acting against the clamp and forcing.l the feed-screw outward,land, with it, the worksnpporting table, carrying the face of the workback .from the path of movement of the tool-edge, so that as the toolrises or retreats it runs free from the work.

Before the tool next descends or moves'forward, the movement of the linkya: is reversed and the feedyscrew is carried to its former position,except so far as such position may have been modified by thesimultaneous movement'of the feed mechanism, for the next action of thecutting-tool.

It will be obvious that the result of the backaction mechanism will bethe samein whichever direction the work is being fed, whether forward orbackward, or transversely or rotatively, the work always being startedlback just after the cutting-movement of 'the tool, and so that whilethe tool itself moves backward in exactly the plane in which it 'movedforward, the face out by' it has been removed sufficiently far for thetool Vtoescape it.

I claim :as my( improvement in machines for slotting or cutting metal-The combination of a Work-supporting table, inechbackward movementthereof', and before it is again anism "to impart feed-movements to saidtable,A a thrust forward, substantially as and for the purposereciprocating cutter, and mechanism to impari; to the herein described.

work-slpporting table slight reciprocal movements SALMDN Wi PUTNAM, JR.to remove the Work away fromithe cutterafter every Witnesses: forward4thrust thereof, and before il: commencesfto FRANCIS GoULD,

reinreat,` and back again to' the cutter after every M. W.FRo'.rH1NGHAM.

